Tube-bender.



G. F. ANDRES.

v TUBE BENDER.

APPLIUATION FILED AP11.29,1909.

L1@ I j Patented Mar. M910.

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To all whom 'it may concern: l

it known that I, GEORGE F. ANDRES, a citizen of the United a-tes, residing at Marion, in the county of Marion and State of Ohio, have invented certain new and useful Improvements in rTube-Benders; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appert-ains to make and use the Same.

rIhis invention relates to improvements in tube benders. i l

rIhe object of the invention is to provide a device of this character by means of which perfect bends may be made in tubes without the use of a core or filling of any-kind.

With the foregoing and other objects in view, the invention consists of certainnovel features of construction, combination and arrangement of parts, as will be more fully described and particularlypointed out in the appended claims.

In Ithe accompanying drawings, Figure 1 is a side View of a bending'tool constructed in accordance w-ith the invention; Fig. 2 is a vertical longitudinal sectional view through the tube holding and bending portion of thel tool, showing a tube in position; Fig. 3 is a cross sectional view on the. line 3-3 of Fig. 2; Fig. t is a side View of a similar form of the tool Fig. 5 is a longitudinal sectional View of Fig. 4, showing the operation of the tool. Fig. 6 is a cross sectional view of the finishing die employed in connection with the bending tool showing an elbow arranged therein for finishing; Fig. 7 is a perspective view ofv the die, showing the parts separated; Fig. 8 is a View of the tool used for finishing the bend or elbow inthe die. f

Referring more particularly to Figs. 1 and 2 of the drawings, 1 denotes the bending tool which comprlses a-pair of tube engaging bars 2 having reduced inner ends 3 which are rounded off on one side, as shown at 4, The bars 2 are provided on their outer ends with handles 5 and on one side of the bars, adjacent to the handles 5 are `v.revolubly mounted guide rollers 6. On the reduced inner ends of the tube engaging bars 2 are tube holding sleeves 7 said sleeves having their inner ends rounded or.. beveled oif, as shown at 8. g

In connection with the. form of the tool shown in Figs. 1 and 2, I provide a tube holding block 9 which is preferably formed 1n separable sections which are held together by dowel pins 10. Each section of the block is formed with a transversely disposed semi-circular groove which, when the sectlons of the block are brought together, forms a cylindrical passage or seat to receive the tube 12. @ne section of the block 9 is i secured to the upper end of a supporting bar 13 to which is also secured a semi-circ ular guide bar 14 with which is slidably engaged the bars 2 and with the outer edge of which is engaged the guide rollers 6 which are revolubly mounted on the bars 2 as hereinbefore described. n B means ofthe guide bar 14, the tube engaging bars 2 will be steadied and guided in their movement. In thebar 1d is formed a seriesof apertures 15 in which are adapted to be inserted stop pins `16 which limit the movementof the bars 2 and thus regulate the amount of bend to be given vto the tube.

In Figs. t and 5- of the drawings is shown a simpler form of the bending tools in which the-holding block 9 and the guide bar and stop mechanism is dispensed with. The form of tool shown in these figures comprises tube bending bars 17 provided with handles 18 and reduced ends 19 which are inserted into the opposite ends of the tube to bebent. bars 17 are arranged sleeves 2O which it over the ends of the tube and thereby hold the same in position while being bent. After the bars 17 are thus engaged with the tube, the handles 18 are Imoved toward each other, thereby bending the tube to the desired extent or curvature. e

In connection with the bending tool herein shown and` described, I 'employ a finishing or bolling die, in which any irregularities or imperfections in the bends or bows formed by the bending tool are removed and the bends completed to form perfectlysinooth even elbows.

The finishing die 21 is preferably constructed v in separable sections 22` and 23 @n the reduced ends ofthe ously bent b the bending tool in the man- 7 ner describe I After thelbent tube has thus j nection with been-engaged with the groove one or the other section of-the die, vthe sectlons of the die are placed together thus securely holding the elbow or bent tube to permit the bend therein`to be completed and an irregularities or imperfections removed erefrom by means of the-bolling tool 25. Y' ,The bollin tool 25 employed 1n cone die, prises a handle portion 26 having a tapered' outer end which- 1s 'bent or curved, as shown at 27 and is rovided on its outer end a ball 28 w ichV is adapted to be inserted in one end of the tube-or elbow in the die and forced therethrough, thus straigh .11 out the imperfections or irregularities in the bends of the tube by forcing the bent walls thereof into engagement with the walls of the groove formed ina the die. During the `finishing operation of the elbow, the sections of the die are preferably held together in a vise or other suitable clamping device and said sections of the die are preferabl rovided with dowel lpins 29 by means o which the grooves therein are held in perfect alinetool of this character is A. tube .beni i' for formin elbows, re-

especially adap turn bends ory angle ells em oyed in the manufacture of brass musica instruments.-

The same may be employed, however, for

sheet metal tubing.

From the foregoing description taken in connection' with. the accompanying drawings, the construction and operation of the invention, will be readily understood without requiring a more' extended'explanation.

Y outer ends of said bending bars.

2. In a tube bending tool, a pair of correi sponding bending bars havin curved or rounded integral inner ends a apted to fit the ends of the tube to be bent, tube holding sleeves on said bars adapted to be engaged with the ends of the tube, a separable tube forming elbows or bends in any form of' holding block to receive the tube, a block supporting bar, and means whereby said bending bars nre guided and limited in their movement.

3. In a tube bending tool, a pair of bending bars adapted to be engaged with the ends of the tube to be bent, tube holding sleeves on said bars, a tube holding block, a' supporting bar secured to said block, a guide bar secured to said supporting bar and having formed therein a series of apertures, gulde rollers revolubly mounted on said bending bars and adapted to engage the edge 'of said guide bar, stop pins adapted to be engaged with the apertures in said guide bar to limit the movement of said bending bars and thereby re ulate the bend or curvature of the tube, an operating handles arranged on said bending bars.

4.` In a tube bending tool, a pair of corresponding hand operated bending bars having reduced rounded inner ends to iit in the endsof the tube to be bent, tube holding sleeves on the inner ends of said bars to receive the ends of the tube, a separable tube holding block comprising a pair of corresponding sections, a. block supportingv bar, and means secured to said supporting bar and engagin the ends of the bending bars, whereby sai bars are guided and limited in their movement. v

5. In a tube bending tool, a pair of corresponding hand operated bendlng bars having reduced rounded inner ends to fit in the ends of the tube, a separable tube holding block, a block supporting bar, and means secured to said supporting bar and engaging the ends of the bending bars for guiding the bending bars in the arc of a circle during the bending operation.

6. In a tube bending tool, a pair of bending bars t'o be engaged with the ends of the tube to be bent, tube holding sleeves on said bars, a tube holdingblock, a supporting bar secured to said block, a semi-circular guide bar secured to said supporting bar and adapted to guide the movement of the bending bars during the bending operation, and

rollers on the bending bars to bear upon the outer edge of said guide bar.

In testimony whereof I have hereunto set my hand in presence of two subscribing witl nesses.

. GEORGE F. ANDRES.

Witnesses:

PATRICK J. MoNAHAN, T. D. ULRICH. 

